From 《
汉书·
司马相如传下》 (Hàn Shū, 'Book of Han', biography of Sima Xiangru): '
故鄙谚曰:
家累千金,
坐不垂堂' — 'thus the proverb says: a household worth a thousand pieces of gold does not sit beneath the eaves.'
垂堂 (chuítáng) refers to the dripline of a roof — sitting there risked falling roof tiles, a real hazard in Han architecture.